Great write up, David Listening to my F4 now.

Nice review. Not a cable believer but would a silver cable help with the treble "issue" you mentioned?

@davidcotton It’s not really an issue but a tuning choice, cables might bring more sparkle as well as sources. It might help make the F4 brighter but I like it the way it is I just wished for a little more sparkle there but I am influenced by my latest purchase like the EM64

Nice review! Would have loved to read a few comparisons though.